Having problems when coding the AI.

Hello. I was following AI Tutorial series and I ran into one problem. I watched the tutorial where it showed, on how to make the enemy wander script. I use Unity 4, and Unity 4 doesn't have NavMesh.AllAreas. What should I do? Is there any other solution?

https://postimg.org/image/6yj35dtt3/

The script:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. public class Enemy_NavWander : MonoBehaviour
4. {
5.     private Enemy_Master enemyMaster;
6.     private NavMeshAgent myNavMeshAgent;
7.     private float checkRate;
8.     private float nextCheck;
9.     public float wanderRange = 10;
10.     private Transform myTransform;
11.     private NavMeshHit navHit;
12.     private Vector3 wanderTarget;
13.     void OnEnable ()
14.     {
15.         SetInitialReferences ();
16.         enemyMaster.EventEnemyDie += DisableThis;
17.     }
18.     void OnDisable ()
19.     {
20.         enemyMaster.EventEnemyDie -= DisableThis;
21.     }
22.     void Update ()
23.     {
24.         if(Time.time > nextCheck)
25.         {
26.             nextCheck = Time.time + checkRate;
27.             CheckIfIShouldWander();
28.         }
29.     }
30.     void SetInitialReferences ()
31.     {
32.         enemyMaster = GetComponent<Enemy_Master> ();
33.         if(GetComponent<NavMeshAgent>() != null)
34.         {
35.             myNavMeshAgent = GetComponent<NavMeshAgent>();
36.         }
37.         checkRate = Random.Range (0.3f, 0.4f);
38.         myTransform = transform;
39.     }
40.     void CheckIfIShouldWander()
41.     {
42.     }
43.     bool RandomWanderTarget(Vector3 centre, float range, out Vector3 result)
44.     {
45.         Vector3 randomPoint = centre + Random.insideUnitSphere * wanderRange;
46.        if(NavMesh.SamplePosition(randomPoint, out navHit, 1.0f,   This is where I got stuck.. Cause I don't have NavMesh.AllAreas))
47.       {
48.       }
49.   }
50.   void DisableThis ()
51.   {
52.       this.enabled = false;
53.   }
54. }

 

AllAreas is simply a shorthand for a bitmask of all areas - you can simply use -1 or ~0 (to set all bits).

 

Thank you!